Injection molding torpedo with shaft having ceramic central port

Details Injection molding torpedo with shaft having ceramic central port Injection molding torpedo with shaft having ceramic central port

1993-04-29

1994-02-08

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means to heat or cool

26432815, 425570, 425572, B29C 4520

Patent

active

052844366

ABSTRACT:
Injection molding apparatus wherein a torpedo is mounted in the front end of a heated nozzle. The torpedo has spaced blades extending inwardly from an outer collar to an elongated shaft which extends centrally in the melt bore. The torpedo shaft has an elongated central portion which is securely press fitted in a steel outer sleeve from which the blades extend. The elongated central portion of the torpedo shaft extends forwardly into the gate, and is formed of an engineered ceramic such as silicon carbide which is very thermally conductive as well as abrasion and corrosion resistant. In one embodiment, the gate extends through a gate insert which is also formed of a thermally conductive and abrasion and corrosion resistant engineered ceramic material.

REFERENCES:
patent: 4450999 (1984-05-01), Gellert
patent: 4771164 (1988-09-01), Gellert

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